Sounds like one of those things that all addons need to work around .. spotted that error message while testing nUI but have not clue how to correct it as it doesn't highlight what part of nUI is causing the problem if any.

I can not download the file:
The latest version of this file is currently awaiting approval from a file admin. You can download a previous (older) version from the archive.

Thanks for the fast update. I want to test your addon with my heal druid.

It just needed to be scanned and approved by staff.

__________________
"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh

I played around with the options and everything seems to work.
I have successfully healed a 5man dungeon with VuhDo

You probably did use some buffs/debuffs in your bouquets that no longer exist. Please reset the addon: Exit Game, run reset_vuhdo.bat in vuhdo addon folder. Will try to offer a fix for this with next update.

You probably did use some buffs/debuffs in your bouquets that no longer exist. Please reset the addon: Exit Game, run reset_vuhdo.bat in vuhdo addon folder. Will try to offer a fix for this with next update.

This error vanished. I dont know why.
Yesterday, I reseted the configration with the bat file but the error was still there.
Today, I configured my Vuhdo again for 5man dungeon and the error was gone...